Improvement in school desks and seats



.l. B. SHERWOOD.

School-Desks and Seat s.

' Patented April 15, 1873.

AM PHGTU-LITHOGHAFHIO ca NX (USED/#15:? P600555.)

UNITED STATES PATENT OFFICE.

JOHN B. SHERWOOD, OF CHICAGO, ILLINOIS.

IMPROVEMENT IN SCHOOL DESKS AND SEATS.

Specification forming part of Letters Patent No. 137,866, dated April15, 1873; application filed March 19, 1873.

To all whom it may concern:

Be it known that I, JOHN B. SHERWOOD, of Chicago, in the county of Cookand State of Illinois, have invented a new and useful Improvement inHinges for School-Desk Seats, of which the following is a specification:

The nature of the present invention consists in a three-plate hinge forsupporting the foldin g seat-arm. The plate attached to said arm rotatesbetween the standard-plate and a capplate, and strikes against rubberbuffers dovetailed into projecting lugs, and the cap-plate is screwedfast to the standard-plate, and kept from rotating by means of pinsprojecting out from said lugs, as the whole is hereinafter fullydescribed and shown.

In the drawing, Figure 1 is an end elevation of a school-desk and seatprovided with my improved hinge. Fig. 2 is an elevation of thestandard-plate; Fig. 3, an elevation of the arm-plate; Fig. 4, a sectionof the hinge taken on line b b Fig. 2 Fig. 5, an elevation of thecap-plate.

J represents a face-plate attached to or cast solid to the standard B ofthe frame A D C, and provided with outwardly-projecting lugs S S andprojecting pivot M. The lugs S have dovetailed into them rubber buffersL L for the internal projection G G on the central plate I to strikeagainst when the seat-arm l, is raised or lowered, the projecting part GG being provided with an annular ring, H, which rotates on the pivot M,and is thus held in place. The thickness of the arm-plate G H Icorresponds to the thickness of the projecting lugs S and pivot M,therefore the arm-plate will readily rotate between the cap F andstandard-plate J. The cap F is kept from rotating by means of pins K Kprojecting out from the lugs S, and through the cap, and it is fastenedto the pivot M by a screw Z. The rubbers L can be cut a little long, soas to cushion the plate F and thus prevent noise.

I do not claim a foldingseat hinge, as such devices are old; but confinemyself to the following claim I claim and desire to secure by LettersPatent- A hinge or joint for folding seats for schooldesks, consistingof the standard-plate J armplate I, and capplate F, when constructed andcombined as and for the purpose set forth.

JOHN B. SHERWOOD.

Witnesses:

G. L. CHAPIN, H. L. WAIL.

